2 9*x + 6*x + 1
9*x^2 + 6*x + 1 при x = 1/3
9*x^2 + 6*x + 1
9*(1/3)^2 + 6*(1/3) + 1
9*(1/3)^2 + 6/3 + 1
4
1.0 + 6.0*x + 9.0*x^2
1 + 3*x*(2 + 3*x)
2 (1 + 3*x)